They called him Tommy “Karate” Pitera, but he should have been known as “The Butcher.”

After the infamous Bonanno capo killed his victims, he dragged them into a bathtub and dismembered them limb by limb with the precise skill of a professional, according to a bombshell new book, “The Butcher: Anatomy of a Mafia Psychopath” (William Morrow) by Philip Carlo.

He was the baddest of the bad,” Carlo told The Post. “He scared the scary guys.”